A developer is writing a Dockerfile to install Python packages. The current Dockerfile has three separate RUN instructions: one to update apt, one to install build tools, and one to run pip install. The developer wants to reduce the number of image layers and improve cache efficiency. Which change is most appropriate?

Combine the three RUN instructions into a single RUN using &&

Keep the three RUN instructions but reorder them alphabetically

Use ADD with a URL to download and execute a script

Replace the RUN instructions with a single COPY of a shell script

What is the effect of each RUN instruction in a Dockerfile?

It defines a volume for persistent storage

It sets an environment variable

It creates a new layer in the image

CiscoCertified Network Associate Automation (CCNA Automation)

Domain 4Objective 6

6. Interpret Contents of a Dockerfile 200-901 Practice Questions (Page 3)

Part of the 4.0 Application Deployment and Security domain, which accounts for 15% of the 200-901 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~8–12 in this domain), expect 1–1 from this objective — we provide 43 practice questions to prepare you well beyond it. (estimate)

43questions here

9free pages

12concepts

15%of the exam

Questions 11–15

11application · easy
A team is containerizing a network configuration backup tool that writes output files to /var/backups. The container must allow the host to persist these backups across container restarts. The Dockerfile should declare the mount point. Which instruction is correct?
Select an answer first
12application · medium
A developer is writing a Dockerfile to install Python packages. The current Dockerfile has three separate RUN instructions: one to update apt, one to install build tools, and one to run pip install. The developer wants to reduce the number of image layers and improve cache efficiency. Which change is most appropriate?
Select an answer first
13foundation · easy
Which Dockerfile feature allows you to use multiple FROM instructions to create a smaller final image?
Select an answer first
14foundation · easy
What is the effect of each RUN instruction in a Dockerfile?
Select an answer first
15application · easy
A build context contains a directory with large log files and a secrets directory. The developer wants to ensure these are not sent to the Docker daemon during the build. Which file should be created in the build context root?
Select an answer first

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6. Interpret Contents of a Dockerfile 200-901 Practice Questions (Page 3)

Questions 11–15

A team is containerizing a network configuration backup tool that writes output files to /var/backups. The container must allow the host to persist these backups across container restarts. The Dockerfile should declare the mount point. Which instruction is correct?

Which Dockerfile feature allows you to use multiple FROM instructions to create a smaller final image?

What is the effect of each RUN instruction in a Dockerfile?

A build context contains a directory with large log files and a secrets directory. The developer wants to ensure these are not sent to the Docker daemon during the build. Which file should be created in the build context root?

Keep studying — 4.0 Application Deployment and Security